Malicious PDF — malware analysis report

Static analysis result for SHA-256 1195647288b8627c…

MALICIOUS

PDF

81.1 KB Created: 2021-09-02 13:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: db794f5f7d01dd22b3ec03c878c386d6 SHA-1: 4bf06cc6849cac811fe9f6ad7255d90ec25632b0 SHA-256: 1195647288b8627c658a0e313d928c09db1dd41a67cd142da2b3ce834cd7cdec
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links. Several heuristics indicate these links point to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to distribute malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to a phishing or malware distribution attack pattern. ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://varbackaforskola.se/ckfinder/userfiles/files/gutujapibilevipatalil.pdf In PDF document text
    • http://twothirdsmajority.us/clients/38522/File/21187268562.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/4515615235.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a592fdd6157---93257832302.pdfIn PDF document text
    • http://spbi.cz/res/file/22026243859.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/1a4698824e6981df0b8574bf875a3a40/xomirumadexetukemu.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c502b02bd49---54358654065.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/kamiwukusamulalivolad.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/tobamivo.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/wivofav.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/83782053585.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/56765317191.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/303e75a2380816e1dedbd26dcf2e3389/21403507599.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/30216374489.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c10a96dbe6f---galomelafonusivixa.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/96852287299.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c800a9f95f---92030150108.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/34761205860.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e633cb6309b---64913129394.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tebepuwuw.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/15e4e7555972d07e602e327b65dd6235/17426169392.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/82034983863.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/56654322844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=quantum+field+theory+condensed+matter+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BA 17436 bytes
SHA-256: fe6fca1ebe3814cae42e615557ecd1c2407eec13cb5bccde01d8290b5c548f52
font_01_sfnt_off00010507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1E 11160 bytes
SHA-256: 2cfab80df8138f811feae02ca1e2d74f3e2aed2249d4114fd09182dc42097e92

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